Baseball Reference now has stat lines for the minors, but I don't think they keep splits and game logs, so I go to minorleaguebaseball.com. They also added a feature recently where you can sort daily box scores by affiliate, which is a good way to just give it a once-over and look for any interesting lines:

http://www.milb.com/scoreboard/index.jsp?sid=milb&org=142&ymd=20130407

Though, my Buxton enthusiasm meant I completely missed the big Cedar Rapids story this weekend, which is that three pitchers combined to throw a no-hitter for the Twins low-A affiliate. Only one is a semi-prospect that I know of, Tyler Duffy, who went 7 IP with 7 K. But pretty cool for all of those guys.

Additionally, the latest Twins group-blog project, Twinsdaily.com has enough writers scattered around the country that they've been posting actual game stories with a focus on Twins prospects that, say, the local Cedar Rapids paper might not include. That's where the tidbit about Sano's glove came from, for instance.